21/x=9

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Solution for 21/x=9 equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

21/x = 9 // - 9

21/x-9 = 0

21*x^-1 = 9 // : 21

x^-1 = 3/7

-1 < 0

1/(x^1) = 3/7 // * x^1

1 = 3/7*x^1 // : 3/7

7/3 = x^1

x = 7/3

x = 7/3

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